JP2719171B2 - Heating facility with a hot water circuit for sanitary use - Google Patents

Abstract

Central heating installation equipped with a domestic hot water, or sanitary water, circuit, which comprises a heating apparatus comprising a shell, the internal part of which is equipped with a burner, in particular a gas burner, and on which there is rolled up or not a pipe of the heating circuit, which then passes through a bank of fins situated on the upper part of the shell, on the trajectory of the hot gases, the heating circuit in passing through the bank of fins being made in the form of a large number of flattened tubes connected to one another by elbows and the sanitary hot water circuit being made in the form of a pin-shaped or serpentine-shaped tube and arranged inside said flattened tubes on passing through the bank of fins, characterised in that: - the tubes (12') of the sanitary hot water circuit, arranged in the manner of a pin or of a serpentine in the flattened tubes (10') of the heating water circuit, are not in contact with the latter and - the dimensions of said flattened tubes (10') and of said tubes (12') are chosen in such a manner that the volume of water contained between the flattened tubes and the convolutions of the tubes in the form of a pin is as small as possible. <IMAGE>

Description

The present invention comprises a burner, in particular a gas burner, at the bottom,
A duct through which water flows through the heating circuit includes a wrapped or unwrapped jacket or an annular shell over which the heating circuit is located on the path of the hot gas escaping from the hood over the hood. A central heating facility with a hot water circuit for domestic or sanitary water, including a heating device that extends through the assembly and subsequently to an exhaust duct.

BACKGROUND OF THE INVENTION A warm sanitary water circuit includes a second duct through which heated water flows, the second duct being in close thermal contact with the first duct through which heated water flows. Central heating facilities of this type, which extend through the assembly, are already known.

French Patent No. 1352607 discloses that a tight thermal connection between a first duct in which the heating circuit water flows and a second duct in which the sanitary water flows, wherein the double duct extends through the wing assembly. Obtained by combining two ducts to form a passage tube, which tube exposes a heating facility with a suitable cross section, for example a circular or oval cross section.

According to Belgian Patent No. 671097, a tight thermal connection between the double ducts for the heating water circuit and for the sanitary water supply circuit, respectively, combines one duct inside the other duct and thus two ducts Is achieved by extending the inner surface of the inner tube against the inner surface of the outer tube, extending through the wing assembly of the heating device, preferably in a concentric form of two tubes. There are known singing facilities.

Experience has shown that in a heating device of the type described here, the contact surface between the water sent by the heating duct and the sanitary water duct located inside the heating duct is too limited. However, complete heat exchange between the two ducts is not possible. As a result, if there is no long-term water circulation in one of the ducts, the temperature can exceed the temperature of the moving water, in which case the total amount of heat collected by the non-circulating water is This means that heat is not necessarily transferred to the circulating water. as a result,
In these known facilities, it is necessary to activate the heating water circuit promoting device to obtain circulation of the heating water in order to obtain the immediate heating of the sanitary water. This will force the central heating facility to have a separate circuit to get this circulation when not working (summer).

To alleviate these difficulties, French Patent No. 4848
In No. 21, where extending through the wing assembly, the heating water circuit is provided in the form of a plurality of flat tubes connected by a shoulder to each other, and the sanitary water circuit is S-shaped or hairpin-shaped. A heat exchanger was considered in which a bent tube was provided inside a flat tube forming a heating water circuit.

In such known facilities, the straight wall of the sanitary water circuit is plated and the sanitary water circuit is generally soldered to the corresponding wall of the flat tube of the heated water circuit located inside it. . This arrangement has a significant disadvantage, i.e. in that case, because there is a direct thermal contact between the hot gas flowing through the wing assembly and the sanitary water circuit and the heated water circuit, Physical contact can lead to water boiling for sanitary reasons.

OBJECTS AND DESCRIPTION OF THE INVENTION It is an object of the present invention to provide an improved facility that does not have the aforementioned disadvantages.

The subject of the present invention therefore comprises an annular body with a burner inside, in particular a gas burner, wound or unwound over a heating circuit duct, which heating circuit duct extends and later on the upper part of the annular body Through the wing assembly located on the path of the hot gas and the heating circuit takes the form of a plurality of flat tubes connected by an elbow to each other at a portion passing through the wing assembly, the flat tubes passing through the wing assembly. Inside the extension, there is provided a hot water circuit for domestic or sanitary water, including a heating device in which the hot water circuit is placed and provided in a hairpin or coiled tube. At the central heating facility, the hot sanitary water circuit pipe placed as a hairpin-shaped pipe or coil pipe inside the flat pipe of the heating water circuit does not contact the flat pipe, and the flat pipe and the warm sanitary Dimension of clean water circuit pipe It is the heating facility, characterized in that it is one that is chosen to be as small as possible the volume of water contained between the convolution of the flat tube and the warm sanitary water supply circuit pipe.

According to one aspect, the invention provides that, at points outside the wing assembly, end pieces are brazed or soldered onto each end of the flat tube to seal the ends. This end part is
It has the shape of a flat plate, in which there is a first opening for connecting a bent pipe provided for the connection between the coil pipe of the sanitary water duct or the hairpin type pipe, and between two successive flat pipes And a second opening for connecting a bend tube provided for the connection of the two.

According to another aspect of the invention, to further enhance the heat exchange between the heated water circuit and the sanitary water supply circuit, a tube or coiled tube bent into a hairpin shape inside the flat tube. A heat transfer surface is provided during the convolution.

According to the invention, the heat transfer surface is provided in the form of a metal plate, partially having a cylindrical portion that matches the shape of the hairpin tube to be engaged and connected by a vertical plane portion.

Other features and advantages of the present invention will become more apparent from the details set forth below, with reference to the accompanying drawings, which illustrate embodiments that are not limiting in nature.

Referring to the accompanying drawings, and in particular to FIGS. 1 and 2, a heating device that is the subject of the present invention comprises a first duct 10 for heating water in a central heating circuit, and domestic or sanitary water. It is observed that it includes a second duct for heating the second duct. To improve the heat transfer, the two ducts have a tight heat exchange at the top of the heating device where the wing assembly 18 (partially shown in FIGS. 1 and 2) is located.

In accordance with the present invention, the duct 10 'of the circuit into which the heated water flows at this top of the heating device comprises a plurality of oblate or substantially oblong cross-sections, each having a longitudinal axis oriented vertically. In the form of a tube 10 '. As will be disclosed in more detail later in this specification, different flat tubes 10 'laid in parallel are connected at their ends by bent tubes indicated at 14.

The sanitary water duct 12 is preferably made of a tube having a circular cross section and is located inside and extends through the flat tube, such as 10 '. Meanwhile, the duct 12 has the form of a hairpin or a coiled tube, with the heating water flowing through the flat tube 10 'and the sanitary water contained in the hairpin-shaped tube 12' extending through the flat tube. The heat exchange surface between them is considerably increased. As can be clearly seen from FIG. 1, each tube 10 'which forms part of the heating water circuit, while extending through the wing assembly 18, has a hairpin-shaped portion 12' of the sanitary water duct. Has been accepted. The position of the hairpin-shaped tube 12 'in the flat tube 10' forming the heating water duct is determined by the wall of the tube 12 'and the tube 10'.
Care is taken that there is no contact between the walls. Moreover,
The cross section of the hairpin tube 12 'is such that the volume of water contained between the flat tube 10' and the hairpin or coil tube 12 'is as small as possible, so that all of the heated water can be removed without the use of heating circuit facilitators. It is selected to recover heat. Tube 1
The lack of contact between the 0 'and 12' walls prevents the boiling of sanitary water flowing through the tube 12 '.

According to the invention, the closing of the end of the flat tube 10 'is effected by means of an end piece in the form of a flat plate (FIGS. 3, 4). This end piece secures the connection between the opening 22 in connection with the bent tube 16 for connecting between two successive coiled or hairpin-shaped tubes and the two successive flat tubes 10 '. A second opening 24 for connection of the curved tube 14 is formed. End plate 20 is preferably brazed to the end of tube 10 '.

FIG. 5 shows one embodiment of the wing 18. It has a series of openings 26, corresponding to the cross section of the flat tube 10 '. The wings are successively pierced by the texture of a parallel tube 10 'and brazed to the tube 10' in a known manner (see FIG. 2).

Two liquids (heated water and sanitary water) form the wing assembly 18
In order to further improve the heat exchange between the two liquids as they flow through, a special heat exchange surface 28 connecting the convolutions of the hairpin or coil tubes 12 'merged into each flat tube 10' Can be biased.

In the embodiment shown in FIGS. 6 and 7, this special heat exchange surface is a flat plate with a cylindrical portion 30 partially engaging the various portions of the tube 12 'bent into a hairpin. In shape.
This cylindrical part 30 is connected to a vertical plane part 32. FIG. 7 shows the relative position of the tube 12 'having a flat plate 28 bent into a hairpin and the flat tube 10' in which the hairpin tube 12 'is located. Plate 28 may be brazed on tube 12 '.

It has been observed that the present invention provides a maximum heat exchange surface between the two ducts 10 'and 12', resulting in a complete heat exchange between the heated water circuit and the sanitary water circuit. You.

8 to 11, the tube 12 'arranged as a hairpin or coil tube has a structure integral with the flat plate 28. This tube-to-plate assembly has a
It is stamped into the shape of two half-shells 34.34 'connected by an arrow, and is formed quickly, for example, by pressurization, ultrasonic waves or the like without using a filling metal.

In an alternative embodiment of the invention, shown in FIG. 12, in a hairpin or coiled tube 12 'in which sanitary water flows, the tube 12' is a tube in which heated water flows.
The portion near the wall 10 'has a slightly bent shape, and the tube 12' is provided with a plurality of rings 38 made of a heat and water resistant plastic such as silicone. I have. As shown in FIG. 12, the annulus is fitted to the tube 12 'at regular intervals. This particular arrangement has the following dual advantages: First, it is possible to avoid any contact between the tubes forming the duct 10 'through which the heated water flows and the tubes 12'. On the other hand, when the sanitary tap water flows through the coil pipes forming the sanitary tap water duct, vibrations caused by hydraulic causes in equipment of this type are eliminated.

Upon reading the above description, the present invention is based on the relative positions of the two ducts, the hairpin tube shape of the sanitary water circulation duct extending through the flat tube of the heated water duct, and each flat tube. Due to the small volume of water contained between the tube formed in the hairpin contained therein and the large thermal contact surface obtained without physical direct contact of both circuits Preferably, the arrangement of the plastic material ring fitted in the pipes forming the sanitary water circuit, by maintaining the sanitary water pipes separated from the pipes making up the heated water circuit, by any hydraulic causes It has been found that it provides a heating facility that ensures complete heat exchange between the heated water and the sanitary water in an integrated tube, benefiting from the elimination of the vibration source.

Due to these new features, even if one of the ducts (such as a heated water duct in summer) has no circulation for a long time,
Since the maximum amount of heat collected by the non-circulating water is transferred to the circulating water, the temperature of the non-circulating water cannot exceed the temperature of the moving water.

On the other hand, even if the circulation is stopped in one of the ducts, it is always possible to get the full capacity generated by the heating device from the other duct. Finally, the circulation of the water in both circuits allows the invention to distribute the entire capacity of the device to the two circuits as a function of the desired flow rate of the heated water, while also preventing boiling of the water for hot and sanitary purposes. . In addition, the present invention provides significant savings in material (brazing material) over known solutions involving connecting tubes.

Of course, the invention is not limited to the embodiments shown and described above, but encompasses all variants of those embodiments.

[Brief description of the drawings]

FIG. 1 of the accompanying drawings shows the relative arrangement of a heated water duct and a sanitary water duct in a position extending through a wing assembly located on the top of the annular body of the heating device, partly vertically. It is a side view shown in section. FIG. 2 is a plan view corresponding to FIG. FIGS. 3 and 4 are side and front views, respectively, of an end piece of the present invention for closing each end of the duct at the point where each facility duct exits the wing assembly. FIG. 5 is a plan view of one wing forming a part of the wing assembly of the heating device. FIG. 6 is a vertical cross-sectional view of one embodiment of a surface for improved heat transfer between a heated water contained in a flat tube and a hairpin shaped duct for sanitary water supply. FIG. 7 is a vertical sectional view showing the arrangement of the heat transfer surface shown in FIG. 6 in the heating water duct. FIGS. 8, 9, 10 and 11 show a side view, a plan view and a sectional view along the line XI-XI of FIG. 8 of a variant embodiment of the invention. FIG. 12 is a schematic view similar to FIG. 1, showing another modified embodiment of the present invention. 10… First duct, 12… Second duct 14… Bent tube, 16… Bent tube 18… Wing assembly, 22… Opening 24… Opening, 26… Opening 28… Heat exchange Surface, 30 cylindrical part 32 flat part 34 half shell 36 joint surface 38 ring

Claims (7)

(57) [Claims] 1. A burner, especially a gas burner, is provided inside.
A heating circuit duct including a toroidal body wound thereon or unwound, the heating circuit duct extending and subsequently passing through a wing assembly located on the top of the toroidal body and on the path of hot gas, the heating circuit duct comprising: The circuit takes the form of a plurality of flat tubes connected by an elbow to each other at a portion passing through the wing assembly, and inside the flat tubes extending through the wing assembly,
In a central heating facility with a hot water circuit for domestic or sanitary water, including a heating device in which the hot water sanitary water circuit is laid and provided in a hairpin or coiled tube; The warm sanitary water circuit tube placed as a hairpin-shaped tube or coil tube inside the flat tube of the heating water circuit does not contact the flat tube, and the dimensions of the flat tube and the warm sanitary water circuit tube are flat. The heating facility, characterized in that the heating facility is selected so that the volume of water contained between the pipe and the convolution of the thermal sanitation water circuit pipe is as small as possible. 2. Outside the wing assembly, each end of the flat tube is provided with an end piece which is brazed or soldered to the end to seal the pipe, wherein the end piece is ,
A first opening for connecting a bent pipe provided for connection between the coil pipes of the sanitary water duct or the hairpin type pipe,
2. The heating facility according to claim 1, wherein the heating facility has a shape of a flat plate formed with a second opening for connecting a curved pipe provided for connection between two successive flat pipes. 3. A hairpin-shaped tube inside the flat tube to further enhance heat exchange between the heating water circuit and the sanitary water circuit extending through the wing assembly. A heat transfer surface is provided between the convolutions of the coil tubes.
The heating facility described. 4. The heat transfer surface has, in part, a cylindrical portion which conforms to the shape of a hairpin tube on which the surface is to be engaged, and to which a vertical flat portion is connected. 4. The heating facility according to claim 3, wherein the heating facility is in the form of a metal plate. 5. The heating facility according to claim 3, wherein the metal plate is brazed on a hairpin-shaped tube. 6. Two half-shells in which a tube arranged in the form of a hairpin or arranged as a coiled pipe is constructed in one piece with said metal plate, said tube and plate assembly being connected by an articulating plane. 6. The heating facility according to claim 3, wherein the heating facility is stamped in the form of a solid, and is fixed to each other by brazing without pressure, in particular by pressure, ultrasonic waves or the like. 7. A tube or coiled tube arranged in the form of a hairpin into which sanitary water flows has a slightly bent shape at a portion located near the wall of the tube into which heated water flows. The tube or coil tube arranged in the form of a hairpin comprises a plurality of rings made of a water and heat resistant plastics material such as silicone, the rings being fitted to the tube at regular intervals. Claims 1, 2, 3, 4,
The heating facility according to 5 or 6.